Headache on the pill.
D003276:Contraceptives, Oral / Q000009:adverse effects*; D004717:Endometrium / Q000098:blood supply / Q000187:drug effects; D005260:Female; D006261:Headache / Q000139:chemically induced*; D006801:Humans; D011372:Progestins / Q000494:pharmacology
D003276:Contraceptives, Oral; D011372:Progestins